JPS6428534A - Curvature radius measuring apparatus and method - Google Patents
Curvature radius measuring apparatus and methodInfo
- Publication number
- JPS6428534A JPS6428534A JP18216587A JP18216587A JPS6428534A JP S6428534 A JPS6428534 A JP S6428534A JP 18216587 A JP18216587 A JP 18216587A JP 18216587 A JP18216587 A JP 18216587A JP S6428534 A JPS6428534 A JP S6428534A
- Authority
- JP
- Japan
- Prior art keywords
- curvature
- radius
- distance
- convex
- backfocus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Testing Of Optical Devices Or Fibers (AREA)
Abstract
PURPOSE:To enable highly accurate measurement regardless of greater radius of curvature in concave and convex surfaces, by substituting a backfocus distance and a specified moving distance of a spherical surface to be measured into a specified expression to determine the radius of curvature. CONSTITUTION:In the case of a convex surface, an object 29 to be measured is put on a carrier 26 to be moved and a backfocus distance L to a luminous flux converging point P3 from a lens surface 24a is read with a length measuring device 30 to be stored into a memory means 31. A moving distance S is calculated between a position CP1 where a spherical surface 29a is at the point P3 and a position CP2 where a converging point P4 in reflection back is on the lens surface 24a. The distances L and S are substituted into the following expression of r=2/[1/S-1/(L-S)] to determine the radius of curvature (r) and in the case of a convex surface, the radius of curvature is also determined in the same way. This enables highly accurate measurement of curvature regardless of greater radius of curvature of the concave surface and the convex surface.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18216587A JP2511271B2 (en) | 1987-07-23 | 1987-07-23 | Curvature radius measuring device and measuring method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18216587A JP2511271B2 (en) | 1987-07-23 | 1987-07-23 | Curvature radius measuring device and measuring method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6428534A true JPS6428534A (en) | 1989-01-31 |
JP2511271B2 JP2511271B2 (en) | 1996-06-26 |
Family
ID=16113488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18216587A Expired - Lifetime JP2511271B2 (en) | 1987-07-23 | 1987-07-23 | Curvature radius measuring device and measuring method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2511271B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001235317A (en) * | 2000-02-22 | 2001-08-31 | Fuji Photo Optical Co Ltd | Apparatus for measuring radius of curvature of optical spherical surface |
JP2010019750A (en) * | 2008-07-11 | 2010-01-28 | Olympus Corp | Curvature radius measuring apparatus |
-
1987
- 1987-07-23 JP JP18216587A patent/JP2511271B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001235317A (en) * | 2000-02-22 | 2001-08-31 | Fuji Photo Optical Co Ltd | Apparatus for measuring radius of curvature of optical spherical surface |
JP2010019750A (en) * | 2008-07-11 | 2010-01-28 | Olympus Corp | Curvature radius measuring apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2511271B2 (en) | 1996-06-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080416 Year of fee payment: 12 |